Which of the following fields CANNOT change the speed of the...

Which of the following fields CANNOT change the speed of the object that is
acted upon by the field?
I. Uniform gravity field
II. Uniform electric field
III. Uniform magnetic field

(A) I only
(B) II only
(C) III only
(D) Both I and II
(E) Both II and III

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Key Concepts

Work-Energy Principle

This principle states that the net work done on an object is equal to its change in kinetic energy. In contexts where forces act perpendicularly to the displacement of an object, no work is done and the object's speed (or kinetic energy) remains unchanged.

Magnetic Force and Its Characteristics

A magnetic force, when exerted on a moving charged particle, always acts at a right angle to the velocity of the particle. Because of this perpendicular orientation, the magnetic force does not perform work on the particle, meaning it cannot change the particle's speed but only its direction of motion.

Uniform Fields and Their Effects on Motion

Uniform fields, whether gravitational, electric, or magnetic, have consistent magnitude and direction across space. Their influence on an object's motion depends on the alignment of the force relative to the velocity. Fields like gravitational and electric fields can do work and change an object’s speed if the force has a component along the direction of motion, in contrast to magnetic fields, which do not alter speed because their forces are always perpendicular to the motion.

Transcript

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